library(MAST)
Loading required package: SummarizedExperiment
Loading required package: GenomicRanges
Loading required package: GenomeInfoDb
Loading required package: DelayedArray
Loading required package: matrixStats

Attaching package: ‘matrixStats’

The following objects are masked from ‘package:Biobase’:

    anyMissing, rowMedians


Attaching package: ‘DelayedArray’

The following objects are masked from ‘package:matrixStats’:

    colMaxs, colMins, colRanges, rowMaxs, rowMins, rowRanges

The following object is masked from ‘package:base’:

    apply


Attaching package: ‘MAST’

The following object is masked from ‘package:stats’:

    filter

Simple PCAs to begin

for(i in 1:length(data)){
  y <- data[[i]]$human
  pca <- prcomp(t(y[order(-1*apply(y,1,var)),][1:1000,]),scale=T)
  pca <- cbind(data[[i]]$meta,CDR=colSums(y>0),pca$x)
  print(ggpairs(pca, columns=c('PC1', 'PC2', 'PC3', 'PC4', 'CDR'),
          mapping=aes(color=Treatment), upper=list(continuous='cor')))   
}

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The CDR clearly correlates strongle to the either or both the 1st and/or 2nd principal components (PCs). This makes it clear that the CDR should always be considered when performing any modelling. Let’s us see the propotion of variance accounted for by these first PCs.

lapply(data,function(x){
  y <- x$human
  pca <- prcomp(t(y[order(-1*apply(y,1,var)),][1:1000,]),scale=T)
  eigs <- pca$sdev^2
  rbind("Prop. of Var."=eigs[1:5] / sum(eigs),"Cum. Sum. Prop. of Var."=cumsum(eigs[1:5])/sum(eigs))
})
$VHI098
                              [,1]       [,2]       [,3]       [,4]       [,5]
Prop. of Var.           0.08551196 0.03397286 0.02837749 0.01915273 0.01623797
Cum. Sum. Prop. of Var. 0.08551196 0.11948482 0.14786231 0.16701503 0.18325300

$VHI098.resist
                              [,1]       [,2]      [,3]       [,4]      [,5]
Prop. of Var.           0.05854842 0.04428817 0.0273953 0.02453004 0.0207859
Cum. Sum. Prop. of Var. 0.05854842 0.10283658 0.1302319 0.15476192 0.1755478

$HCI009
                             [,1]       [,2]       [,3]       [,4]       [,5]
Prop. of Var.           0.1145667 0.04506263 0.02884657 0.01993381 0.01282113
Cum. Sum. Prop. of Var. 0.1145667 0.15962932 0.18847589 0.20840970 0.22123083
for(i in 1:length(data)){
  y <- cbind(data[[i]]$meta,CDR=colSums(data[[i]]$human > 0))
  if("Response" %in% names(y)){
    print(ggplot(y) + aes(x=Response,y=CDR,fill=Response,group=Sample) + geom_violin(draw_quantiles = c(.25,.5,.75)))
  } else {
    print(ggplot(y) + aes(x=Treatment,y=CDR,fill=Treatment,group=Sample) + geom_violin(draw_quantiles = c(.25,.5,.75)))
  }
}

It is clear that the CDR has been driving a lot of our observations. Whether this is biological is seperate question, but regardless we should include it in our modelling attempts. Let us perform the DE analysis using edgeR, as done by Mike, but this time including the CDR.

DE Analysis

Niave Model (no CDR)

This is the orginal model used by Mike. For this initial test, we will only use the VHIO098 dataset. For reference, Mike’s analysis returned:

TreatmentTreated vs. TreatmentUntreated -1 1398 0 9854 1 2210

design.mat <- model.matrix(~ 0 + Treatment + Sample, data=data$VHI098$meta)
contrast.mat <-  makeContrasts(TreatmentTreated-TreatmentUntreated, levels=design.mat)
vfit <- lmFit(data$VHI098$human, design.mat)
Coefficients not estimable: SampleSIGAH11 
Partial NA coefficients for 13462 probe(s)
vfit <- contrasts.fit(vfit, contrasts=contrast.mat)
efit <- eBayes(vfit)
DE <- as.data.table(topTable(efit,p.value = 0.05, n=Inf),keep.rownames=TRUE)
DE[,direction:=factor(logFC>0)]
levels(DE$direction) <- c("down.reg","up.reg")
models <- list()
models$niave <- DE
DE[,.N,direction]

As expected, this is the same as what Mike obtained.

Niave model with CDR

Let’s first look at the relative AICs when adding this factor.

aic <- with(cbind(data$VHI098$meta,CDR=colSums(data$VHI098$human>0)),
            selectModel(data$VHI098$human, list(
              model.matrix(~ 0 + Treatment + Sample),
              model.matrix(~ 0 + Treatment + Sample + CDR)
            ), criterion="aic"))
Coefficients not estimable: SampleSIGAH11 
Partial NA coefficients for 13462 probe(s)
Coefficients not estimable: SampleSIGAH11 
Partial NA coefficients for 13462 probe(s)
table(aic$pref)

    1     2 
 2853 10609 
table(exp(as.numeric(diff(t(aic$IC[aic$pref=="2",])))/2) < 0.05) #FDR correction needed?

FALSE  TRUE 
 2281  8328 

The AIC shows that the majority of genes are fitted better by the model that incorporates the CDR. Furthermore, the propabilities that this model is an improvement for this “subset” leaves no doubts as to using it.

design.mat <- model.matrix(~ 0 + Treatment + Sample + CDR,
                           data=cbind(data$VHI098$meta,CDR=colSums(data$VHI098$human>0)))
contrast.mat <-  makeContrasts(TreatmentTreated-TreatmentUntreated, levels=design.mat)
vfit <- lmFit(data$VHI098$human, design.mat)
Coefficients not estimable: SampleSIGAH11 
Partial NA coefficients for 13462 probe(s)
vfit <- contrasts.fit(vfit, contrasts=contrast.mat)
efit <- eBayes(vfit)
DE <- as.data.table(topTable(efit,p.value = 0.05, n=Inf),keep.rownames=TRUE)
DE[,direction:=factor(logFC>0)]
levels(DE$direction) <- c("down.reg","up.reg")
models$niave.CDR <- DE
DE[,.N,direction]

We see a large reduction in the number of up.reg genes which is not quite matched matched by an increase in the number of down.reg genes. In total, the extra coeffienct reduces the total number of DE genes by roughly 600. This is a good indication that it should be included in the model, as the number of samples is such that are we are fairly safe from overfitting. What is the overlap between these models?

x <- merge(models$niave[,.(rn,ID,niave=direction)],
      models$niave.CDR[,.(rn,ID,niave.CDR=direction)],
      by=c("rn","ID"),all=TRUE,)
levels(x$niave) <- c(-1,1,0)
levels(x$niave.CDR) <- c(-1,1,0)
x[is.na(x)] <- 0
vennDiagram(x[,.(niave,niave.CDR)],cex=0.8,include="up",main="Up.reg.DE")

vennDiagram(x[,.(niave,niave.CDR)],cex=0.8,include="down",main="Down.reg.DE")

Logistic Model

For this model, let us model the expression as either on (!=0) or off (==0). Then let’s use logistic regression to model the treatment effect.

data.binary <- as.data.table(data$VHI098$human != 0)
data.binary[,row.id:=.I]
DE <- with(data$VHI098$meta,
     data.binary[, as.list(summary(glm(unlist(.SD)~Treatment+Sample+cdr))$coefficients[2,]), row.id]
     )
DE$row.id <- rownames(data$VHI098$human)
DE[,fdr:=p.adjust(`Pr(>|t|)`, 'fdr')]
DE <- DE[fdr<0.05]
DE[,direction:=factor(Estimate>0)]
levels(DE$direction) <- c("down.reg","up.reg")
models$logistic <- DE
DE[,.N,direction]

Zero-inflated model

We need to first determine an appropiate threshold to below which we set the value to zero.

thres <- thresholdSCRNACountMatrix(data$VHI098$human, nbins = 20, min_per_bin = 30)
(0.427,0.729] (0.729,0.903]  (0.903,1.09]   (1.09,1.31]   (1.31,1.54]   (1.54,1.79]   (1.79,2.08]   (2.08,2.39]   (2.39,2.73]    (2.73,3.1]    (3.1,3.52]   (3.52,3.97]   (3.97,4.47]   (4.47,5.02] 
            0             0             0             0             0             0             0             0             0             0             0             0             0             0 
   (5.02,6.3]    (6.3,8.73] 
            0             0 
par(mfrow=c(5,4))
print(plot(thres))
$ask
[1] FALSE

Mike’s normalisation has apparently already done this and at all median expression binnings, the threshold is reported as zero.

expMat <- as.matrix(data$VHI098$human)
rownames(expMat) <- make.names(rownames(expMat),unique = T)
cData <- as.data.frame(cbind(data$VHI098$meta,CDR=colSums(data$VHI098$human>0)))
rownames(cData) <- colnames(expMat)
cData$Treatment <- factor(cData$Treatment,levels = c("Untreated","Treated"))
fData <- data.frame(gene=rownames(expMat))
rownames(fData) <- rownames(expMat)
x <- FromMatrix(expMat,cData,fData)
`fData` has no primerid.  I'll make something up.
`cData` has no wellKey.  I'll make something up.
y <- zlm(~ Treatment + Sample + CDR, x)
Coefficients SampleSIGAH11 are never estimible and will be dropped..................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................
Done!
z <- summary(y,doLRT="TreatmentTreated")
Combining coefficients and standard errors
Calculating log-fold changes
Calculating likelihood ratio tests
Refitting on reduced model...
.................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................
Done!
z <- z$datatable
DE <- merge(
  z[contrast=='TreatmentTreated' & component=='H',.(primerid, `Pr(>Chisq)`)],
  z[contrast=='TreatmentTreated' & component=='logFC', .(primerid, coef, ci.hi, ci.lo)],
by='primerid')
DE[,fdr:=p.adjust(`Pr(>Chisq)`, 'fdr')]
DE <- DE[fdr<0.05]
DE[,direction:=factor(coef>0)]
levels(DE$direction) <- c("down.reg","up.reg")
models$zero.inf <- DE
DE[,.N,direction]

Note that the above model calls something as DE if the hurdle (gene being on or off) is signifgantly altered w.r.t. to the contrast tested. There does not have to be a change in the expression of genes that are “on”.

What is the overlap w.r.t. the other models?

x <- merge(models$niave[,.(rn,ID,niave=direction)],
      models$niave.CDR[,.(rn,ID,niave.CDR=direction)],
      by=c("rn","ID"),all=TRUE,)
x <- merge(x,
           models$zero.inf[,.(primerid,zero.inf=direction)],
           by.x=c("ID"),by.y=c("primerid"),all=TRUE)
x <- merge(x,
           models$logistic[,.(row.id,logistic=direction)],
           by.x=c("ID"),by.y=c("row.id"),all=TRUE)
levels(x$niave) <- c(-1,1,0)
levels(x$niave.CDR) <- c(-1,1,0)
levels(x$zero.inf) <- c(-1,1,0)
levels(x$logistic) <- c(-1,1,0)
x[is.na(x)] <- 0
vennDiagram(x[,.(niave,niave.CDR,zero.inf,logistic)],cex=0.8,include="up",main="Up.reg.DE")

vennDiagram(x[,.(niave,niave.CDR,zero.inf,logistic)],cex=0.8,include="down",main="Down.reg.DE")

And let’s see what happends when we enforce a LFC threshold.

x <- merge(models$niave[abs(logFC)>.5,.(rn,ID,niave=direction)],
      models$niave.CDR[abs(logFC)>.5,.(rn,ID,niave.CDR=direction)],
      by=c("rn","ID"),all=TRUE,)
x <- merge(x,
           models$zero.inf[abs(coef)>.5,.(primerid,zero.inf=direction)],
           by.x=c("ID"),by.y=c("primerid"),all=TRUE)
levels(x$niave) <- c(-1,1,0)
levels(x$niave.CDR) <- c(-1,1,0)
levels(x$zero.inf) <- c(-1,1,0)
x[is.na(x)] <- 0
vennDiagram(x[,.(niave,niave.CDR,zero.inf)],cex=0.8,include="up",main="Up.reg.DE")

vennDiagram(x[,.(niave,niave.CDR,zero.inf)],cex=0.8,include="down",main="Down.reg.DE")

DE genes plots

Finally, let’s make a few pretty plots of the most DE genes for each model.

Niave model

DE <- models$niave
i <- which(rownames(data$VHI098$human) %in% DE[order(adj.P.Val)][abs(logFC)>.5][1:16,ID])
x <- merge(melt(data$VHI098$human[i,]),data$VHI098$meta,by.x=c("Var2"),by.y=c("sub.sample"))
ggplot(x) + aes(x=Treatment,y=value,group=Sample,fill=Treatment) + geom_violin(draw_quantiles = c(.5)) + facet_wrap(~Var1,scale='free_y')

DE <- models$niave
i <- which(rownames(data$VHI098$human) %in% DE[order(adj.P.Val)][abs(logFC)>.5][1:50,ID])
j <- data$VHI098$meta[,order(Treatment)]
labels.col <- rep("",length(i))
ann.col <- as.data.frame(data$VHI098$meta[j,.(Sample,Treatment)])
rownames(ann.col) <- data$VHI098$meta[j,sub.sample]
pheatmap(data$VHI098$human[i,j],labels_col=labels.col,annotation_col = ann.col,cluster_cols = F)

Niave CDR model

DE <- models$niave.CDR
i <- which(rownames(data$VHI098$human) %in% DE[order(adj.P.Val)][abs(logFC)>.5][1:16,ID])
x <- merge(melt(data$VHI098$human[i,]),data$VHI098$meta,by.x=c("Var2"),by.y=c("sub.sample"))
ggplot(x) + aes(x=Treatment,y=value,group=Sample,fill=Treatment) + geom_violin(draw_quantiles = c(.5)) + facet_wrap(~Var1,scale='free_y')

DE <- models$niave.CDR
i <- which(rownames(data$VHI098$human) %in% DE[order(adj.P.Val)][abs(logFC)>.5][1:50,ID])
j <- data$VHI098$meta[,order(Treatment)]
labels.col <- rep("",length(i))
ann.col <- as.data.frame(data$VHI098$meta[j,.(Sample,Treatment)])
rownames(ann.col) <- data$VHI098$meta[j,sub.sample]
pheatmap(data$VHI098$human[i,j],labels_col=labels.col,annotation_col = ann.col,cluster_cols = F)

Zero-inflated model

DE <- models$zero.inf
i <- which(rownames(data$VHI098$human) %in% DE[order(fdr)][abs(coef)>.5][1:16,primerid])
x <- merge(melt(data$VHI098$human[i,]),data$VHI098$meta,by.x=c("Var2"),by.y=c("sub.sample"))
ggplot(x) + aes(x=Treatment,y=value,group=Sample,fill=Treatment) + geom_violin(draw_quantiles = c(.5)) + facet_wrap(~Var1,scale='free_y')

DE <- models$zero.inf
i <- which(rownames(data$VHI098$human) %in% DE[order(fdr)][abs(coef)>.5][1:50,primerid])
j <- data$VHI098$meta[,order(Treatment)]
labels.col <- rep("",length(i))
ann.col <- as.data.frame(data$VHI098$meta[j,.(Sample,Treatment)])
rownames(ann.col) <- data$VHI098$meta[j,sub.sample]
pheatmap(data$VHI098$human[i,j],labels_col=labels.col,annotation_col = ann.col,cluster_cols = F)

---
title: 'PDX: Drug trails'
author: "Alistair Martin"
date: '`r format(Sys.time(), "Last modified: %d %b %Y")`'
output:
  pdf_document:
    toc: yes
  html_notebook:
    toc: yes
    toc_float: yes
  html_document:
    toc: yes
    toc_float: yes
subtitle: scRNAseq Selu Trail
layout: page
---

```{r, message=F, warning=F}
root.dir <- "~/OneDrive/projects/"
source(paste0(root.dir,"R.utils/RNASEQ.utils.R"))
project.dir <- paste0(root.dir,"PDX/")
fname <- paste0(project.dir,"data/Rdata.dumps/scRNAseq.selu.Rdata")
library(MAST)

if(file.exists(fname)){
  load(fname)
} else {
  save(data,file=paste0(project.dir,"results/scRNAseq.shiny.hist/data/scRNAseq.processed.Rdata"))
  
  hg19.ensembl <- useEnsembl(biomart='ensembl', dataset='hsapiens_gene_ensembl', GRCh=37)
  
  data <- list()
  data$VHI098 <- fread(paste0(project.dir,"data/scRNAseq/ALL_hg19-SFnorm.tsv"))
  data$VHI098.resist <- fread(paste0(project.dir,"data/scRNAseq/VHIO98_resist-SFnorm.tsv"))
  data$HCI009 <- fread(paste0(project.dir,"data/scRNAseq/HCI009-SFnorm.tsv"))
  datasets <- names(data)
  
  data <- lapply(datasets,function(dataset){
    x <- data[[dataset]]
    gene_ids <- x[,gsub(gene_id, pattern="hg19_", replacement="")]
    gene_symbols <- getBM(attributes=c('ensembl_gene_id', 'external_gene_name'),filters='ensembl_gene_id', mart=hg19.ensembl,values=gene_ids)
  
    if(dataset=="VHI098"){
      meta.data <- data.table(Sample=c("SIGAA11", "SIGAC11", "SIGAD11", "SIGAE11", "SIGAF11", "SIGAG11", "SIGAH11"),
                              Treatment=c("Treated", "Treated", "Treated", "Untreated", "Treated", "Untreated", "Untreated"),
                              Response=c("Responder", "Resistant", "Resistant", "Untreated", "Responder", "Untreated", "Untreated"))
    } else if(dataset=="VHI098.resist"){
      meta.data <- data.table(Sample=c("SIGAA8", "SIGAB8", "SIGAC8", "SIGAD8", "SIGAE8", "SIGAG8"),
                              Treatment=c("Treated", "Untreated", "Treated", "Untreated", "Treated", "Untreated"))
    } else if(dataset=="HCI009"){
      meta.data <- data.table(Sample=c("SIGAA7", "SIGAB7", "SIGAC7", "SIGAD7", "SIGAE7", "SIGAF7", "SIGAG7"),
                              Treatment=c("Treated", "Untreated", "Untreated", "Untreated", "Untreated", "Treated", "Treated"),
                              Response=c("Responder", "Untreated", "Untreated", "Untreated", "Untreated", "Responder", "Resistant"))
    } else { 
      stop("dataset not recognised")
    }
    uber.meta <- data.table(sub.sample=head(colnames(x),-1))
    uber.meta[,Sample:=tstrsplit(sub.sample,"_")[1]]
    uber.meta <- merge(uber.meta, meta.data)
    
    y <- list()
    y$meta <- uber.meta
    y$human <- as.matrix(x[, 1:(dim(x)[2]-1)])
    rownames(y$human) <- gene_symbols$external_gene_name
    y
  })
  names(data) <- datasets
  
  save(data,file=paste0(project.dir,"results/scRNAseq.shiny.hist/data/scRNAseq.processed.Rdata"))
}
```

# Simple PCAs to begin

```{r}
for(i in 1:length(data)){
  y <- data[[i]]$human
  pca <- prcomp(t(y[order(-1*apply(y,1,var)),][1:1000,]),scale=T)
  pca <- cbind(data[[i]]$meta,CDR=colSums(y>0),pca$x)
  print(ggpairs(pca, columns=c('PC1', 'PC2', 'PC3', 'PC4', 'CDR'),
          mapping=aes(color=Treatment), upper=list(continuous='cor')))   
}
```

The CDR clearly correlates strongle to the either or both the 1st and/or 2nd principal components (PCs). This makes it clear that the CDR should always be considered when performing any modelling. Let's us see the propotion of variance accounted for by these first PCs. 

```{r}
lapply(data,function(x){
  y <- x$human
  pca <- prcomp(t(y[order(-1*apply(y,1,var)),][1:1000,]),scale=T)
  eigs <- pca$sdev^2
  rbind("Prop. of Var."=eigs[1:5] / sum(eigs),"Cum. Sum. Prop. of Var."=cumsum(eigs[1:5])/sum(eigs))
})
```



```{r}
for(i in 1:length(data)){
  y <- cbind(data[[i]]$meta,CDR=colSums(data[[i]]$human > 0))
  if("Response" %in% names(y)){
    print(ggplot(y) + aes(x=Response,y=CDR,fill=Response,group=Sample) + geom_violin(draw_quantiles = c(.25,.5,.75)))
  } else {
    print(ggplot(y) + aes(x=Treatment,y=CDR,fill=Treatment,group=Sample) + geom_violin(draw_quantiles = c(.25,.5,.75)))
  }
}
```

It is clear that the CDR has been driving a lot of our observations. Whether this is biological is seperate question, but regardless we should include it in our modelling attempts. Let us perform the DE analysis using edgeR, as done by Mike, but this time including the CDR.

# DE Analysis

## Niave Model (no CDR)

This is the orginal model used by Mike. For this initial test, we will only use the VHIO098 dataset. For reference, Mike's analysis returned:

TreatmentTreated vs. TreatmentUntreated
-1	1398
0	9854
1	2210

```{r}
design.mat <- model.matrix(~ 0 + Treatment + Sample, data=data$VHI098$meta)
contrast.mat <-  makeContrasts(TreatmentTreated-TreatmentUntreated, levels=design.mat)
vfit <- lmFit(data$VHI098$human, design.mat)
vfit <- contrasts.fit(vfit, contrasts=contrast.mat)
efit <- eBayes(vfit)
DE <- as.data.table(topTable(efit,p.value = 0.05, n=Inf),keep.rownames=TRUE)
DE[,direction:=factor(logFC>0)]
levels(DE$direction) <- c("down.reg","up.reg")

models <- list()
models$niave <- DE

DE[,.N,direction]
```
 
As expected, this is the same as what Mike obtained.

## Niave model with CDR

Let's first look at the relative AICs when adding this factor.

```{r}
aic <- with(cbind(data$VHI098$meta,CDR=colSums(data$VHI098$human>0)),
            selectModel(data$VHI098$human, list(
              model.matrix(~ 0 + Treatment + Sample),
              model.matrix(~ 0 + Treatment + Sample + CDR)
            ), criterion="aic"))
table(aic$pref)
table(exp(as.numeric(diff(t(aic$IC[aic$pref=="2",])))/2) < 0.05) #FDR correction needed?
```

The AIC shows that the majority of genes are fitted better by the model that incorporates the CDR. Furthermore, the propabilities that this model is an improvement for this "subset" leaves no doubts as to using it.

```{r}
design.mat <- model.matrix(~ 0 + Treatment + Sample + CDR,
                           data=cbind(data$VHI098$meta,CDR=colSums(data$VHI098$human>0)))
contrast.mat <-  makeContrasts(TreatmentTreated-TreatmentUntreated, levels=design.mat)
vfit <- lmFit(data$VHI098$human, design.mat)
vfit <- contrasts.fit(vfit, contrasts=contrast.mat)
efit <- eBayes(vfit)
DE <- as.data.table(topTable(efit,p.value = 0.05, n=Inf),keep.rownames=TRUE)
DE[,direction:=factor(logFC>0)]
levels(DE$direction) <- c("down.reg","up.reg")
models$niave.CDR <- DE
DE[,.N,direction]
```

We see a large reduction in the number of up.reg genes which is not quite matched matched by an increase in the number of down.reg genes. In total, the extra coeffienct reduces the total number of DE genes by roughly 600. This is a good indication that it should be included in the model, as the number of samples is such that are we are fairly safe from overfitting. What is the overlap between these models?

```{r}
x <- merge(models$niave[,.(rn,ID,niave=direction)],
      models$niave.CDR[,.(rn,ID,niave.CDR=direction)],
      by=c("rn","ID"),all=TRUE,)
levels(x$niave) <- c(-1,1,0)
levels(x$niave.CDR) <- c(-1,1,0)
x[is.na(x)] <- 0
vennDiagram(x[,.(niave,niave.CDR)],cex=0.8,include="up",main="Up.reg.DE")
vennDiagram(x[,.(niave,niave.CDR)],cex=0.8,include="down",main="Down.reg.DE")
```

## Logistic Model

For this model, let us model the expression as either on (!=0) or off (==0). Then let's use logistic regression to model the treatment effect. 

```{r}
data.binary <- as.data.table(data$VHI098$human != 0)
data.binary[,row.id:=.I]
DE <- with(data$VHI098$meta,
     data.binary[, as.list(summary(glm(unlist(.SD)~Treatment+Sample+cdr))$coefficients[2,]), row.id]
     )
DE$row.id <- rownames(data$VHI098$human)
DE[,fdr:=p.adjust(`Pr(>|t|)`, 'fdr')]
DE <- DE[fdr<0.05]
DE[,direction:=factor(Estimate>0)]
levels(DE$direction) <- c("down.reg","up.reg")
models$logistic <- DE
DE[,.N,direction]
```

## Zero-inflated model

We need to first determine an appropiate threshold to below which we set the value to zero.

```{r}
thres <- thresholdSCRNACountMatrix(data$VHI098$human, nbins = 20, min_per_bin = 30)
par(mfrow=c(5,4))
print(plot(thres))
```

Mike's normalisation has apparently already done this and at all median expression binnings, the threshold is reported as zero.

```{r}
expMat <- as.matrix(data$VHI098$human)
rownames(expMat) <- make.names(rownames(expMat),unique = T)
cData <- as.data.frame(cbind(data$VHI098$meta,CDR=colSums(data$VHI098$human>0)))
rownames(cData) <- colnames(expMat)
cData$Treatment <- factor(cData$Treatment,levels = c("Untreated","Treated"))
fData <- data.frame(gene=rownames(expMat))
rownames(fData) <- rownames(expMat)
x <- FromMatrix(expMat,cData,fData)

y <- zlm(~ Treatment + Sample + CDR, x)
z <- summary(y,doLRT="TreatmentTreated")
z <- z$datatable
```

```{r}
DE <- merge(
  z[contrast=='TreatmentTreated' & component=='H',.(primerid, `Pr(>Chisq)`)],
  z[contrast=='TreatmentTreated' & component=='logFC', .(primerid, coef, ci.hi, ci.lo)],
by='primerid')
DE[,fdr:=p.adjust(`Pr(>Chisq)`, 'fdr')]
DE <- DE[fdr<0.05]
DE[,direction:=factor(coef>0)]
levels(DE$direction) <- c("down.reg","up.reg")
models$zero.inf <- DE
DE[,.N,direction]
```

Note that the above model calls something as DE if the hurdle (gene being on or off) is signifgantly altered w.r.t. to the contrast tested. There does not have to be a change in the expression of genes that are "on".

What is the overlap w.r.t. the other models?

```{r}
x <- merge(models$niave[,.(rn,ID,niave=direction)],
      models$niave.CDR[,.(rn,ID,niave.CDR=direction)],
      by=c("rn","ID"),all=TRUE,)
x <- merge(x,
           models$zero.inf[,.(primerid,zero.inf=direction)],
           by.x=c("ID"),by.y=c("primerid"),all=TRUE)
x <- merge(x,
           models$logistic[,.(row.id,logistic=direction)],
           by.x=c("ID"),by.y=c("row.id"),all=TRUE)
levels(x$niave) <- c(-1,1,0)
levels(x$niave.CDR) <- c(-1,1,0)
levels(x$zero.inf) <- c(-1,1,0)
levels(x$logistic) <- c(-1,1,0)
x[is.na(x)] <- 0
vennDiagram(x[,.(niave,niave.CDR,zero.inf,logistic)],cex=0.8,include="up",main="Up.reg.DE")
vennDiagram(x[,.(niave,niave.CDR,zero.inf,logistic)],cex=0.8,include="down",main="Down.reg.DE")
```

And let's see what happends when we enforce a LFC threshold.

```{r}
x <- merge(models$niave[abs(logFC)>.5,.(rn,ID,niave=direction)],
      models$niave.CDR[abs(logFC)>.5,.(rn,ID,niave.CDR=direction)],
      by=c("rn","ID"),all=TRUE,)
x <- merge(x,
           models$zero.inf[abs(coef)>.5,.(primerid,zero.inf=direction)],
           by.x=c("ID"),by.y=c("primerid"),all=TRUE)
levels(x$niave) <- c(-1,1,0)
levels(x$niave.CDR) <- c(-1,1,0)
levels(x$zero.inf) <- c(-1,1,0)
x[is.na(x)] <- 0
vennDiagram(x[,.(niave,niave.CDR,zero.inf)],cex=0.8,include="up",main="Up.reg.DE")
vennDiagram(x[,.(niave,niave.CDR,zero.inf)],cex=0.8,include="down",main="Down.reg.DE")
```

#DE genes plots

Finally, let's make a few pretty plots of the most DE genes for each model.

## Niave model

```{r}
DE <- models$niave
i <- which(rownames(data$VHI098$human) %in% DE[order(adj.P.Val)][abs(logFC)>.5][1:16,ID])
x <- merge(melt(data$VHI098$human[i,]),data$VHI098$meta,by.x=c("Var2"),by.y=c("sub.sample"))
ggplot(x) + aes(x=Treatment,y=value,group=Sample,fill=Treatment) + geom_violin(draw_quantiles = c(.5)) + facet_wrap(~Var1,scale='free_y')
```

```{r}
DE <- models$niave
i <- which(rownames(data$VHI098$human) %in% DE[order(adj.P.Val)][abs(logFC)>.5][1:50,ID])
j <- data$VHI098$meta[,order(Treatment)]
labels.col <- rep("",length(i))
ann.col <- as.data.frame(data$VHI098$meta[j,.(Sample,Treatment)])
rownames(ann.col) <- data$VHI098$meta[j,sub.sample]
pheatmap(data$VHI098$human[i,j],labels_col=labels.col,annotation_col = ann.col,cluster_cols = F)
```

## Niave CDR model

```{r}
DE <- models$niave.CDR
i <- which(rownames(data$VHI098$human) %in% DE[order(adj.P.Val)][abs(logFC)>.5][1:16,ID])
x <- merge(melt(data$VHI098$human[i,]),data$VHI098$meta,by.x=c("Var2"),by.y=c("sub.sample"))
ggplot(x) + aes(x=Treatment,y=value,group=Sample,fill=Treatment) + geom_violin(draw_quantiles = c(.5)) + facet_wrap(~Var1,scale='free_y')
```

```{r}
DE <- models$niave.CDR
i <- which(rownames(data$VHI098$human) %in% DE[order(adj.P.Val)][abs(logFC)>.5][1:50,ID])
j <- data$VHI098$meta[,order(Treatment)]
labels.col <- rep("",length(i))
ann.col <- as.data.frame(data$VHI098$meta[j,.(Sample,Treatment)])
rownames(ann.col) <- data$VHI098$meta[j,sub.sample]
pheatmap(data$VHI098$human[i,j],labels_col=labels.col,annotation_col = ann.col,cluster_cols = F)
```

## Zero-inflated model

```{r}
DE <- models$zero.inf
i <- which(rownames(data$VHI098$human) %in% DE[order(fdr)][abs(coef)>.5][1:16,primerid])
x <- merge(melt(data$VHI098$human[i,]),data$VHI098$meta,by.x=c("Var2"),by.y=c("sub.sample"))
ggplot(x) + aes(x=Treatment,y=value,group=Sample,fill=Treatment) + geom_violin(draw_quantiles = c(.5)) + facet_wrap(~Var1,scale='free_y')
```

```{r}
DE <- models$zero.inf
i <- which(rownames(data$VHI098$human) %in% DE[order(fdr)][abs(coef)>.5][1:50,primerid])
j <- data$VHI098$meta[,order(Treatment)]
labels.col <- rep("",length(i))
ann.col <- as.data.frame(data$VHI098$meta[j,.(Sample,Treatment)])
rownames(ann.col) <- data$VHI098$meta[j,sub.sample]
pheatmap(data$VHI098$human[i,j],labels_col=labels.col,annotation_col = ann.col,cluster_cols = F)
```
